Amazon.com reached a deal with pay-television channel Epix to add movies such as “The Hunger Games” to the roster of films available through Amazon Prime Instant Video, ratcheting up competition with Netflix Inc.

Including films added in the multiyear agreement, the number of titles viewable via the Prime subscription service has more than doubled since Amazon debuted the Kindle Fire media tablet a year ago, the Seattle-based company said today in a statement. Netflix shares fell the most in six weeks.

Amazon, the world’s largest online retailer, is expected to unveil an updated version of the Kindle Fire this week. The tablet comes with a free month of Amazon Prime, a service that costs $79 a year and includes free two-day shipping for online purchases and access to streaming videos. Amazon has been expanding streaming-videos on Prime to compete with Apple Inc.’s iPad and challenge Netflix in the online-movie market.

“The goal for Amazon with tablets is to keep people in their ecosystem, and that’s what they’ve done by adding more content,” said Edward Williams, an analyst at BMO Capital Markets in New York, in an interview. “It removes some of the uniqueness of the Netflix content and makes the Amazon offering more competitive.”

The shares of Los Gatos, California-based Netflix sank as much as 11 percent to $53.13 in New York, the biggest intraday decline since July 25. Amazon fell as much as 1.3 percent to $244.97.

Epix Agreement
Amazon’s agreement with Epix lasts three years, according to a person familiar with the transaction who asked not to be identified because the terms aren’t public.

Netflix Chief Executive Officer Reed Hastings said in July that the company didn’t anticipate being “affected significantly” by Epix movies appearing on competing streaming- video services. “Epix is not a particularly large source of total viewing,” he said on a conference call after the company reported second-quarter earnings.